<title>[ZOJ1654]放置机器人</title><link href="http://hzoi.com/tomorrow.css" rel="stylesheet"><div class="ui existing segment"><pre><code><span class="pl-cp">#include</span> <span class="pl-cpf">&lt;cstdio&gt;</span><span class="pl-cp"></span>
<span class="pl-cp">#include</span> <span class="pl-cpf">&lt;cstring&gt;</span><span class="pl-cp"></span>
<span class="pl-cp">#include</span> <span class="pl-cpf">&lt;iostream&gt;</span><span class="pl-cp"></span>
<span class="pl-k">using</span> <span class="pl-k">namespace</span> <span class="pl-n">std</span><span class="pl-p">;</span>
<span class="pl-k">const</span> <span class="pl-kt">int</span> <span class="pl-n">N</span> <span class="pl-o">=</span> <span class="pl-mi">1250</span><span class="pl-p">;</span>
<span class="pl-kt">char</span> <span class="pl-n">map</span><span class="pl-p">[</span><span class="pl-n">N</span><span class="pl-p">][</span><span class="pl-n">N</span><span class="pl-p">];</span>
<span class="pl-kt">int</span> <span class="pl-n">col</span><span class="pl-p">[</span><span class="pl-n">N</span><span class="pl-p">][</span><span class="pl-n">N</span><span class="pl-p">],</span> <span class="pl-n">row</span><span class="pl-p">[</span><span class="pl-n">N</span><span class="pl-p">][</span><span class="pl-n">N</span><span class="pl-p">],</span> <span class="pl-n">match</span><span class="pl-p">[</span><span class="pl-n">N</span><span class="pl-p">],</span> <span class="pl-n">head</span><span class="pl-p">[</span><span class="pl-n">N</span><span class="pl-p">],</span> <span class="pl-n">cnt</span><span class="pl-p">,</span> <span class="pl-n">n</span><span class="pl-p">,</span> <span class="pl-n">m</span><span class="pl-p">,</span> <span class="pl-n">R</span><span class="pl-o">=</span><span class="pl-mi">1</span><span class="pl-p">,</span> <span class="pl-n">C</span><span class="pl-o">=</span><span class="pl-mi">1</span><span class="pl-p">;</span>
<span class="pl-kt">bool</span> <span class="pl-n">vis</span><span class="pl-p">[</span><span class="pl-n">N</span><span class="pl-p">];</span>
<span class="pl-k">struct</span> <span class="pl-n">Edge</span> <span class="pl-p">{</span> <span class="pl-kt">int</span> <span class="pl-n">to</span><span class="pl-p">,</span> <span class="pl-n">next</span><span class="pl-p">;</span> <span class="pl-p">}</span> <span class="pl-n">edge</span><span class="pl-p">[</span><span class="pl-n">N</span> <span class="pl-o">*</span> <span class="pl-n">N</span><span class="pl-p">];</span>
<span class="pl-kt">void</span> <span class="pl-nf">add</span><span class="pl-p">(</span><span class="pl-kt">int</span> <span class="pl-n">x</span><span class="pl-p">,</span> <span class="pl-kt">int</span> <span class="pl-n">y</span><span class="pl-p">)</span> <span class="pl-p">{</span> <span class="pl-n">edge</span><span class="pl-p">[</span><span class="pl-o">++</span><span class="pl-n">cnt</span><span class="pl-p">]</span> <span class="pl-o">=</span> <span class="pl-p">(</span><span class="pl-n">Edge</span><span class="pl-p">){</span><span class="pl-n">y</span><span class="pl-p">,</span> <span class="pl-n">head</span><span class="pl-p">[</span><span class="pl-n">x</span><span class="pl-p">]},</span> <span class="pl-n">head</span><span class="pl-p">[</span><span class="pl-n">x</span><span class="pl-p">]</span> <span class="pl-o">=</span> <span class="pl-n">cnt</span><span class="pl-p">;</span> <span class="pl-p">}</span>
<span class="pl-kt">bool</span> <span class="pl-nf">dfs</span><span class="pl-p">(</span><span class="pl-kt">int</span> <span class="pl-n">u</span><span class="pl-p">)</span> <span class="pl-p">{</span>
    <span class="pl-k">for</span> <span class="pl-p">(</span><span class="pl-kt">int</span> <span class="pl-n">i</span> <span class="pl-o">=</span> <span class="pl-n">head</span><span class="pl-p">[</span><span class="pl-n">u</span><span class="pl-p">];</span> <span class="pl-n">i</span><span class="pl-p">;</span> <span class="pl-n">i</span> <span class="pl-o">=</span> <span class="pl-n">edge</span><span class="pl-p">[</span><span class="pl-n">i</span><span class="pl-p">].</span><span class="pl-n">next</span><span class="pl-p">)</span> <span class="pl-p">{</span>
        <span class="pl-kt">int</span> <span class="pl-n">v</span> <span class="pl-o">=</span> <span class="pl-n">edge</span><span class="pl-p">[</span><span class="pl-n">i</span><span class="pl-p">].</span><span class="pl-n">to</span><span class="pl-p">;</span>
        <span class="pl-k">if</span> <span class="pl-p">(</span><span class="pl-o">!</span><span class="pl-n">vis</span><span class="pl-p">[</span><span class="pl-n">v</span><span class="pl-p">])</span> <span class="pl-p">{</span>
            <span class="pl-n">vis</span><span class="pl-p">[</span><span class="pl-n">v</span><span class="pl-p">]</span> <span class="pl-o">=</span> <span class="pl-mi">1</span><span class="pl-p">;</span>
            <span class="pl-k">if</span> <span class="pl-p">(</span><span class="pl-o">!</span><span class="pl-n">match</span><span class="pl-p">[</span><span class="pl-n">v</span><span class="pl-p">]</span> <span class="pl-o">||</span> <span class="pl-n">dfs</span><span class="pl-p">(</span><span class="pl-n">match</span><span class="pl-p">[</span><span class="pl-n">v</span><span class="pl-p">]))</span> <span class="pl-p">{</span>
                <span class="pl-n">match</span><span class="pl-p">[</span><span class="pl-n">v</span><span class="pl-p">]</span> <span class="pl-o">=</span> <span class="pl-n">u</span><span class="pl-p">;</span>
                <span class="pl-k">return</span> <span class="pl-nb">true</span><span class="pl-p">;</span>
            <span class="pl-p">}</span>
        <span class="pl-p">}</span>
    <span class="pl-p">}</span>
    <span class="pl-k">return</span> <span class="pl-nb">false</span><span class="pl-p">;</span>
<span class="pl-p">}</span>
<span class="pl-kt">int</span> <span class="pl-nf">main</span><span class="pl-p">()</span> <span class="pl-p">{</span>
    <span class="pl-n">cin</span> <span class="pl-o">&gt;&gt;</span> <span class="pl-n">n</span> <span class="pl-o">&gt;&gt;</span> <span class="pl-n">m</span><span class="pl-p">;</span>
    <span class="pl-k">for</span> <span class="pl-p">(</span><span class="pl-kt">int</span> <span class="pl-n">i</span> <span class="pl-o">=</span> <span class="pl-mi">1</span><span class="pl-p">;</span> <span class="pl-n">i</span> <span class="pl-o">&lt;=</span> <span class="pl-n">n</span><span class="pl-p">;</span> <span class="pl-n">i</span><span class="pl-o">++</span><span class="pl-p">)</span>
        <span class="pl-k">for</span> <span class="pl-p">(</span><span class="pl-kt">int</span> <span class="pl-n">j</span> <span class="pl-o">=</span> <span class="pl-mi">1</span><span class="pl-p">;</span> <span class="pl-n">j</span> <span class="pl-o">&lt;=</span> <span class="pl-n">m</span><span class="pl-p">;</span> <span class="pl-n">j</span><span class="pl-o">++</span><span class="pl-p">)</span> <span class="pl-n">cin</span> <span class="pl-o">&gt;&gt;</span> <span class="pl-n">map</span><span class="pl-p">[</span><span class="pl-n">i</span><span class="pl-p">][</span><span class="pl-n">j</span><span class="pl-p">];</span>
    <span class="pl-k">for</span> <span class="pl-p">(</span><span class="pl-kt">int</span> <span class="pl-n">i</span> <span class="pl-o">=</span> <span class="pl-mi">1</span><span class="pl-p">;</span> <span class="pl-n">i</span> <span class="pl-o">&lt;=</span> <span class="pl-n">n</span><span class="pl-p">;</span> <span class="pl-n">i</span><span class="pl-o">++</span><span class="pl-p">)</span> <span class="pl-p">{</span>
        <span class="pl-k">for</span> <span class="pl-p">(</span><span class="pl-kt">int</span> <span class="pl-n">j</span> <span class="pl-o">=</span> <span class="pl-mi">1</span><span class="pl-p">;</span> <span class="pl-n">j</span> <span class="pl-o">&lt;=</span> <span class="pl-n">m</span><span class="pl-p">;</span> <span class="pl-n">j</span><span class="pl-o">++</span><span class="pl-p">)</span> <span class="pl-p">{</span>
            <span class="pl-k">if</span> <span class="pl-p">(</span><span class="pl-n">map</span><span class="pl-p">[</span><span class="pl-n">i</span><span class="pl-p">][</span><span class="pl-n">j</span><span class="pl-p">]</span> <span class="pl-o">!=</span> <span class="pl-sc">&#39;#&#39;</span> <span class="pl-o">&amp;&amp;</span> <span class="pl-n">row</span><span class="pl-p">[</span><span class="pl-n">i</span><span class="pl-p">][</span><span class="pl-n">j</span><span class="pl-p">]</span> <span class="pl-o">==</span> <span class="pl-mi">0</span><span class="pl-p">)</span> <span class="pl-p">{</span>
                <span class="pl-k">for</span> <span class="pl-p">(</span><span class="pl-kt">int</span> <span class="pl-n">k</span> <span class="pl-o">=</span> <span class="pl-n">j</span><span class="pl-p">;</span> <span class="pl-n">map</span><span class="pl-p">[</span><span class="pl-n">i</span><span class="pl-p">][</span><span class="pl-n">k</span><span class="pl-p">]</span> <span class="pl-o">!=</span> <span class="pl-sc">&#39;#&#39;</span> <span class="pl-o">&amp;&amp;</span> <span class="pl-n">k</span> <span class="pl-o">&lt;=</span> <span class="pl-n">m</span><span class="pl-p">;</span> <span class="pl-n">k</span><span class="pl-o">++</span><span class="pl-p">)</span>
                    <span class="pl-n">row</span><span class="pl-p">[</span><span class="pl-n">i</span><span class="pl-p">][</span><span class="pl-n">k</span><span class="pl-p">]</span> <span class="pl-o">=</span> <span class="pl-n">R</span><span class="pl-p">;</span>
                <span class="pl-n">R</span><span class="pl-o">++</span><span class="pl-p">;</span>
            <span class="pl-p">}</span>
            <span class="pl-k">if</span> <span class="pl-p">(</span><span class="pl-n">map</span><span class="pl-p">[</span><span class="pl-n">i</span><span class="pl-p">][</span><span class="pl-n">j</span><span class="pl-p">]</span> <span class="pl-o">!=</span> <span class="pl-sc">&#39;#&#39;</span> <span class="pl-o">&amp;&amp;</span> <span class="pl-n">col</span><span class="pl-p">[</span><span class="pl-n">i</span><span class="pl-p">][</span><span class="pl-n">j</span><span class="pl-p">]</span> <span class="pl-o">==</span> <span class="pl-mi">0</span><span class="pl-p">)</span> <span class="pl-p">{</span>
                <span class="pl-k">for</span> <span class="pl-p">(</span><span class="pl-kt">int</span> <span class="pl-n">k</span> <span class="pl-o">=</span> <span class="pl-n">i</span><span class="pl-p">;</span> <span class="pl-n">map</span><span class="pl-p">[</span><span class="pl-n">k</span><span class="pl-p">][</span><span class="pl-n">j</span><span class="pl-p">]</span> <span class="pl-o">!=</span> <span class="pl-sc">&#39;#&#39;</span> <span class="pl-o">&amp;&amp;</span> <span class="pl-n">k</span> <span class="pl-o">&lt;=</span> <span class="pl-n">n</span><span class="pl-p">;</span> <span class="pl-n">k</span><span class="pl-o">++</span><span class="pl-p">)</span>
                    <span class="pl-n">col</span><span class="pl-p">[</span><span class="pl-n">k</span><span class="pl-p">][</span><span class="pl-n">j</span><span class="pl-p">]</span> <span class="pl-o">=</span> <span class="pl-n">C</span><span class="pl-p">;</span>
                <span class="pl-n">C</span><span class="pl-o">++</span><span class="pl-p">;</span>
            <span class="pl-p">}</span>
        <span class="pl-p">}</span>
    <span class="pl-p">}</span>
    <span class="pl-k">for</span> <span class="pl-p">(</span><span class="pl-kt">int</span> <span class="pl-n">i</span> <span class="pl-o">=</span> <span class="pl-mi">1</span><span class="pl-p">;</span> <span class="pl-n">i</span> <span class="pl-o">&lt;=</span> <span class="pl-n">n</span><span class="pl-p">;</span> <span class="pl-n">i</span><span class="pl-o">++</span><span class="pl-p">)</span>
        <span class="pl-k">for</span> <span class="pl-p">(</span><span class="pl-kt">int</span> <span class="pl-n">j</span> <span class="pl-o">=</span> <span class="pl-mi">1</span><span class="pl-p">;</span> <span class="pl-n">j</span> <span class="pl-o">&lt;=</span> <span class="pl-n">m</span><span class="pl-p">;</span> <span class="pl-n">j</span><span class="pl-o">++</span><span class="pl-p">)</span>
            <span class="pl-k">if</span> <span class="pl-p">(</span><span class="pl-n">map</span><span class="pl-p">[</span><span class="pl-n">i</span><span class="pl-p">][</span><span class="pl-n">j</span><span class="pl-p">]</span> <span class="pl-o">==</span> <span class="pl-sc">&#39;o&#39;</span> <span class="pl-o">&amp;&amp;</span> <span class="pl-n">row</span><span class="pl-p">[</span><span class="pl-n">i</span><span class="pl-p">][</span><span class="pl-n">j</span><span class="pl-p">]</span> <span class="pl-o">!=</span> <span class="pl-mi">0</span> <span class="pl-o">&amp;&amp;</span> <span class="pl-n">col</span><span class="pl-p">[</span><span class="pl-n">i</span><span class="pl-p">][</span><span class="pl-n">j</span><span class="pl-p">]</span> <span class="pl-o">!=</span> <span class="pl-mi">0</span><span class="pl-p">)</span>
                <span class="pl-n">add</span><span class="pl-p">(</span><span class="pl-n">row</span><span class="pl-p">[</span><span class="pl-n">i</span><span class="pl-p">][</span><span class="pl-n">j</span><span class="pl-p">],</span> <span class="pl-n">col</span><span class="pl-p">[</span><span class="pl-n">i</span><span class="pl-p">][</span><span class="pl-n">j</span><span class="pl-p">]);</span>
    <span class="pl-kt">int</span> <span class="pl-n">ans</span> <span class="pl-o">=</span> <span class="pl-mi">0</span><span class="pl-p">;</span>
    <span class="pl-k">for</span> <span class="pl-p">(</span><span class="pl-kt">int</span> <span class="pl-n">i</span> <span class="pl-o">=</span> <span class="pl-mi">1</span><span class="pl-p">;</span> <span class="pl-n">i</span> <span class="pl-o">&lt;=</span> <span class="pl-n">R</span><span class="pl-p">;</span> <span class="pl-n">i</span><span class="pl-o">++</span><span class="pl-p">)</span> <span class="pl-p">{</span>
        <span class="pl-n">memset</span><span class="pl-p">(</span><span class="pl-n">vis</span><span class="pl-p">,</span> <span class="pl-mi">0</span><span class="pl-p">,</span> <span class="pl-k">sizeof</span><span class="pl-p">(</span><span class="pl-n">vis</span><span class="pl-p">));</span>
        <span class="pl-k">if</span> <span class="pl-p">(</span><span class="pl-n">dfs</span><span class="pl-p">(</span><span class="pl-n">i</span><span class="pl-p">))</span> <span class="pl-n">ans</span><span class="pl-o">++</span><span class="pl-p">;</span>
    <span class="pl-p">}</span>
    <span class="pl-n">printf</span><span class="pl-p">(</span><span class="pl-s">&quot;%d</span><span class="pl-se">\n</span><span class="pl-s">&quot;</span><span class="pl-p">,</span> <span class="pl-n">ans</span><span class="pl-p">);</span>
    <span class="pl-k">return</span> <span class="pl-mi">0</span><span class="pl-p">;</span>
<span class="pl-p">}</span>
</cpde></pre></div>